I am a medically retired Marine Corps Sergeant. I was injured on a deployment in Iraq. I suffered a Traumatic Brain Injury, broke L1-L5 in my back, tore both ACLs, broken wrist.
From that I dealt with some really dark things. I gained tons of weight, pushed everyone away, came so close to committing suicide. But what pulled me through all this and helped me recover to be stronger then I ever was is Fitness. More specific CrossFit.
Now I am inspiring to be a competitive CrossFitter. Here is link to a video that CrossFit HQ did on me. A lot has changed but the idea is the same.